What is creatine and does it pose a risk?
Creatine is the most studied supplement on the market and, paradoxically, the one about which the most misinformation circulates. Two questions dominate research: what it is and whether it is risky. This article addresses only these two. When to take it, the loading phase, and the choice between monohydrate and Creapure are covered elsewhere, and we refer you to those resources rather than repeating them here.
What is creatine?
Creatine is a molecule that your body produces itself from three amino acids: glycine, arginine, and methionine. It is primarily produced by the liver, kidneys, and pancreas.
Therefore, it is neither a hormone, nor a steroid, nor a substance foreign to the body. It was identified as early as 1832 by the French chemist Michel-Eugène Chevreul, who isolated it from meat extract—hence its name, derived from the Greek kreas, meaning flesh.
Where it is found and what it does
Approximately 95% of the body's creatine is stored in skeletal muscle, largely in the form of phosphocreatine. Its role there is very specific: to regenerate ATP, the molecule that provides energy for muscle contraction. During maximum exertion, muscle ATP reserves are depleted in a few seconds; phosphocreatine serves as an immediate reserve to replenish them.
This precisely outlines the area where creatine is useful: very intense and very short, repeated efforts. A sprint, a heavy set, a sequence of starts. It has no demonstrated benefit for a marathon.
Where it comes from in food
The body synthesizes about one gram per day, and food provides roughly the same amount for an omnivore, mainly through meat and fish. A direct and well-established consequence: vegetarians and vegans have lower muscle creatine reserves, and they are the ones who show the most significant improvement with supplementation.
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What does creatine do, and what claims are authorized?
It is one of the very few sports nutrition ingredients to have authorized health claims in Europe, and this should be emphasized because it distinguishes it from almost everything else on the market.
The first, from Regulation 432/2012: "Creatine increases physical performance in successive bursts of short-term, high-intensity exercise." Conditions of use: a daily intake of 3g of creatine, and restricted use for adults performing high-intensity physical exercise.
The second, added by Implementing Regulation (EU) 2017/672, targets a different population: daily creatine consumption can enhance the effect of resistance training on muscle strength in adults over 55 years old. The conditions here are also precise: 3g per day, combined with resistance training performed at least three times a week, at an intensity of 65-75% of maximum load, for several weeks.
Remember the common figure for both: 3g per day. This is the dose on which all regulatory recognition of this ingredient is based, and it is the one that should guide your purchase.
Does creatine pose a risk to the kidneys?
This is a long-standing concern, and there is a response from a French agency.
In its 2016 opinion on food supplements for athletes, ANSES indicates that a dose of less than 3g per day of creatine does not cause adverse effects. It also reports a case of interstitial nephritis that occurred in a person consuming 20g per day, and considers creatine contraindicated in cases of kidney disease, diabetes, or after a nephrectomy.
What to remember, without dramatizing or falsely reassuring: at the dose corresponding to the authorized claims, ANSES does not find any adverse effects. The reported case concerns consumption nearly seven times higher. And there are situations where creatine is explicitly contraindicated—they are listed below and are not debatable.
The creatinine trap in a blood test
Here's the point that causes the most unnecessary worry, and it's purely mechanical. Creatine spontaneously degrades into creatinine, which is eliminated by the kidneys. Supplementation therefore increases blood creatinine—which is precisely the marker used to estimate kidney function.
Result: a blood test may show elevated creatinine and an estimated reduced clearance in someone whose kidneys are functioning perfectly. Tell your doctor you are taking creatine before the blood test. This is the same reflex we recommend for high protein intake in our article on the dangers of whey.
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What are the other actually documented side effects?
Weight gain
This is the most consistent effect, and it is poorly understood. Creatine is osmotically active: by accumulating in the muscle, it draws water into it. A weight gain of about one to two kilograms is frequently reported in the first few weeks, especially with a loading phase.
This water is intramuscular, not subcutaneous: it does not make one "puffy" in the aesthetic sense of the term. But it is real, it appears on the scale, and it is information to know before starting if you monitor your weight closely or compete in a weight category.
Digestive problems
Abdominal cramps, bloating, sometimes diarrhea. They are related to the dose taken at once and the amount of liquid: 5g in a small amount of water is poorly tolerated, the same amount split and well diluted generally passes without problem.
Hair loss
A question asked about once a week at the counter. The origin of this belief is a single study, conducted on a small group of rugby players, which reported an elevation of a testosterone-derived hormone. This result has not been replicated, no trial has measured an effect on hair loss itself, and no authority has issued an opinion on this point. So there is nothing to assert, neither for nor against—and that is exactly what we respond.
Cramps and dehydration
This is an old, often repeated fear. Available research does not show an increase in cramps or heat-related injuries attributable to creatine. This obviously does not mean you shouldn't drink enough during training.
Raw material quality
This is the least discussed and most concrete risk. Creatine synthesis can leave impurities: dicyandiamide, dihydrotriazine, creatinine. Controlled processes limit them to very low levels, and this is the purpose of documented raw materials—a topic we detail in our comparison between creatine monohydrate and Creapure.
Who should refrain from taking creatine?
- Individuals with kidney disease. Explicit contraindication in the ANSES opinion.
- Diabetic individuals and individuals who have undergone a nephrectomy, for the same reason.
- Children and adolescents. ANSES advises against supplements for athletes in this age group.
- Pregnant and breastfeeding women, due to lack of safety data in these situations.
- Individuals with cardiovascular risk factors, heart or liver disease, or neuropsychiatric disorders, in accordance with ANSES's general recommendations for these products.
- Anyone taking medication that may affect kidney function: this question should be posed to a doctor or pharmacist, not a salesperson.
A word about combined formulas: creatine is often incorporated into boosters containing caffeine and other active ingredients. The contraindications of these products are those of the entire formula, not of creatine alone. Pure creatine is, from this perspective, a much simpler product to evaluate.
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How to read a creatine label?
The form, and the real hierarchy. Monohydrate is by far the most studied form, and it is the one on which authorized claims are based. Alternative forms—HCL, kre-alkalyn, malate, esters—are sold based on arguments of absorption or tolerance, with a much thinner body of data. They are not illegitimate; they are simply less documented, and generally more expensive per gram.
The amount per dose, relative to 3g. This is the only check that matters. A 5g scoop of pure monohydrate provides 5g of creatine; a 5g scoop of a blend provides much less, and the label does not always state this clearly.
The mention "micronized." This refers to a finer particle size, which improves suspension. It is a matter of user comfort, not a difference in effectiveness.
The named raw material. When a manufacturer indicates the origin of its creatine and the process, it gives you a verifiable element. An anonymous creatine sold significantly cheaper than the market deserves at least a question.
Proprietary blends. A formula that announces "creatine complex 5,000 mg" without detailing the distribution between several forms does not allow you to know if you are reaching 3g. This is the main drawback of this category.
What not to expect from it
It is not a stimulant: you don't feel it when you take it, unlike a pre-workout. It is not a steroid or a hormonal derivative. It is not a fat burner. It has no demonstrated effect on long-duration endurance. And it does not work identically for everyone: individuals whose muscle reserves are already close to saturation—typically heavy meat eaters—experience slower progress, which is a documented phenomenon and not a product failure.
Finally, it does not replace training or protein intake: creatine improves what you do, it doesn't do it for you.
Frequently asked questions about creatine
What is creatine?
A molecule produced by the body from glycine, arginine, and methionine, 95% stored in muscles and used to regenerate ATP during very intense and short efforts. It is also supplied by meat and fish.
Is creatine dangerous?
ANSES indicates that a dose of less than 3g per day does not cause adverse effects. However, it contraindicates it in cases of kidney disease, diabetes, or after a nephrectomy, and reports a case of interstitial nephritis in a person consuming 20g per day.
Does creatine damage the kidneys?
No adverse effects are noted by ANSES at a dose of 3g per day in a person with normal kidney function. However, be careful with the interpretation of a blood test: creatine raises blood creatinine without altering kidney function. Inform your doctor.
Does creatine cause weight gain?
Yes, generally one to two kilograms in the first few weeks. This is water retained in the muscle due to osmotic effect, not fat mass. This is a point to anticipate if you compete in a weight category.
Does creatine cause hair loss?
There is no evidence to support this. This idea comes from a single study, on a small sample, focusing on a hormone and not on hair, and which has not been replicated. No authority has commented on this point.
How much creatine per day?
The two authorized claims in Europe are based on 3g per day. This is the benchmark to remember; loading protocols and intake schedules are detailed in our article on when to take creatine.
Should it be taken in cycles or continuously?
The authorized claim is based on daily consumption, not on a one-off cycle. Practical details, including the question of discontinuation, are covered in our article on the forms and dosage of creatine monohydrate.
Does a vegetarian benefit more from creatine?
Their initial muscle reserves are lower, as plant-based diets do not provide it. The potential for improvement with supplementation is therefore mechanically greater.
Is creatine a doping product?
No. It is not on the list of prohibited substances, and it has authorized health claims in Europe. Vigilance should be exercised regarding the traceability of the purchased product, as with any supplement for athletes.
This is the product in the section for which we have the most questions and the most solid answers to give: come to our Vendargues store, about ten minutes from Montpellier, if you want to discuss it with the label in hand. The creatine monohydrate section and Creapure references are online.
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